1.) Apples! Get off the couch, find a local farm and go apple picking. I promise you'll enjoy nothing more and you'll want to go back every year.
2.) Garlic. I use garlic in EVERYTHING. It's amazing for your health (not your breath so have gum or mints handy) and is best in late summer/early fall.
3.) Winter Squash (my fave is Butternut!). The best in fall and perfect for roasting. Just cut length wise into 1 inch wide pieces, toss with olive oil, sprinkle with salt & pepper, and roast in the oven at 425 for about 30-45 mins. Perfection!
4.) Sweet Potatoes. So good and good for you (especially your skin!). Bake, roast or mash. Yum!
5.) Pumpkins! Nothing says fall like a bright orange pumpkin. Use pumpkin in everything from pastas to pies. Sprinkle the seeds with oil and salt to roast and use the shell for Halloween decor. No waste!